Influence of the ENSO on the spatial and temporal variability ocurrence of landslides triggered by rain in the Andean region
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Keywords
Landslides, rain, Andean region, ENSO, tropical environments
Abstract
Landslides triggered by rain have caused many human and economic losses in Colombia, especially in the department of Antioquia. According to DesInventar database since 1900 until 2017, 3478 landslides were recorded in the territory of Antioquia and these have left over 2065 fatalities and 74654 damaged homes. This paper presents spatial and temporal rainfall variability and their relationship with historical landslides events under the influence of ENSO in the nine sub-regions of Antioquia. For this purpose, daily rainfall data obtained from 27 IDEAM weather station and 5368 landslides reported in SIMMA and DesInventar database were used in a time window analysis between 1985 and 2016 (32 years). Also, temporal analyses and correlations were performed in daily, monthly and annual scale. According to the results of this study, the occurrence of landslides exhibits bimodal behavior according to temporal rainfall variability, and the strong effect of the cold phase of the ENSO (La Niña) has a strong influence on them. Moreover, landslides showed significant sensitivity to the time-series of rainfall linked to the different sub-regions of Antioquia. The understanding of spatial-temporal rainfall variability in tropical mountains environments is a key element for an appropriate risk management and early warning system implementation and design for hydrometeorological hazards.
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Article Details
Karolina Naranjo Bedoya, Universidad Nacional de Colombia
Karolina Naranjo is a geologist engineer from the National University of Colombia, interested in issues of geological and hydro-meteorological threats. She is currently working on a framework project between the National University and and Isagen within the chapter of sediment dynamics in watersheds of interest.
Edier Vicente Aristizábal Giraldo, Universidad Nacional de Colombia
Geologist engineer at the National University of Colombia, specialist in geological risks at the University of Geneva (Switzerland), Master in science and engineering from the University of Shimane (Japan) and PhD in engineering with an emphasis on hydraulic resources from the National University of Colombia. He currently serves as an assistant professor in the Department of Geosciences and Environment at the National University of Colombia, Medellín.
José Alfred Morales Rodelo, Universidad Nacional de Colombia
José Morales Rodelo, student of last year of Geological Engineering of the Universidad Nacional de Colombia, Sede Medellín, captivated by the knowledge of the risk before geological and hydrometeorological hazards, which he has presented at events such as the technical week of Geology, Geological Engineering and geosciences. Besides, he has participated in a basic hazards studies project, did his internship in the Unidad del Conocimiento of the Departamento Administrativo para el Sistema de Prevención, Atención y Recuperación de Desastres - DAPARD
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